Unique hourglass shape grip tighter in the middle where you want it most when stretching, but with a soft grip. The ends are thicker will not dig or pinch. Inside are two thin raised rings that keep this stretcher where you put it. Squeeze is made from Flex-TPR so it is lightweight and compact but still packs a punch. Unlike silicone, Flex-TPR has a completely different feel for an entirely new stretching sensation. Size height 2 inches, outside circumference 5.5 inches to 6 inches, inside circumference 3.5 inches.